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Cetaceans of the Dilek Peninsula 2019-2020

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Cetaceans of the Dilek Peninsula 2019-2020 CETACEANS OF THE DILEK PENINSULA 2019-2020 AUGUST 19, 2019 WWF-Turkey 1 CROSS-EXAMINING CETACEANS IN THE DILEK CHANNEL ENCOUNTER RATES, POPULATION ESTIMATES, MOVEMENT AND RESIDENCY PATTERNS AND THREAT ASSESSMENT “Cetaceans are going through drastic decline and for some populations reaching up to 70% loss in the last 50 years. The only way to reverse the pattern is through enhancing the knowledge from the bottom to the top!” 2 CONTENTS Cross-examining Cetaceans in the Dilek Channel.................................................................................................................... 2 Summary .................................................................................................................................................................................. 4 Introduction .............................................................................................................................................................................. 5 Previous studıes .................................................................................................................................................................. 7 Long Live Dolphıns by WWF-Turkey ............................................................................................................................... 9 Project objectives ..................................................................................................................................................................... 9 Methods .................................................................................................................................................................................... 9 Study Area .......................................................................................................................................................................... 9 Survey Protocol ................................................................................................................................................................ 11 Visual surveys ................................................................................................................................................................... 11 Acoustic surveys ............................................................................................................................................................... 12 Photo Identification .......................................................................................................................................................... 12 Expected results ...................................................................................................................................................................... 13 References .............................................................................................................................................................................. 14 3 SUMMARY The Aegean Sea, a common corridor between two countries, holds the richest-known cetacean habitats in the entire Eastern Mediterranean Basin. Yet, the same area suffers from a lack of dedicated cetacean research effort, resulting with a gap in baseline knowledge. Consequently, forming one of the strongest barriers to the effective conservation and mitigation strategies for populations that are already known to be declining. Cetaceans, known as an umbrella, flagship and keystone species, are under various anthropogenic threats such as habitat degradation, pollution, marine traffic, unregulated and uncontrolled fisheries and climate change. Up until now, marine protected areas are known to be the strongest defense strategy for the species and habitats of interest, yet so few of them have an in-situ management and/or conservation strategy, ultimately turning to be “paper parks”. The goal of our project is to fill the knowledge gaps on population statuses, residency patterns, abundance and encounter rates of dolphins as well as to determine their habitat usage and the magnitude of human pressure, focusing on marine traffic and fishing impacts in the Dilek Peninsula Protected Area. The results will be reported to the management bodies of the protected area to develop a Species Conservation Action Plan for one of the oldest protected areas in Turkey, the Dilek Peninsula. 4 INTRODUCTION The Aegean Sea is currently home to a diverse assemblage of different marine mammal species, most of which are known to be in decline and classified either as at risk or data deficient (Frantzis, 2009; IUCN 2012). Whilst 8 species are classified as “common”, 4 species are classified as “visitors” in the region; Common species • Bottlenose Dolphin (Tursiops truncatus)- vulnerable (Mediterranean subpopulation) • Short-Beaked Common Dolphin (Delphinus delphis)- endangered (Mediterranean subpopulation) • Striped Dolphin (Stenella coeruleoalba)- vulnerable (Mediterranean subpopulation) • Sperm Whale (Physeter macrocephalus)- endangered (Mediterranean subpopulation) • Cuvier’s Beaked Whale (Ziphius cavirostris)- data deficient (all species) • Risso’s dolphin (Grampus griseus)-data deficient (Mediterranean subpopulation) • Harbour porpoise (Phocoena phocoena relicta)- endangered (Black Sea subspecies) • Mediterranean Monk Seals (Monachus monachus)- endangered Visitor species • Humpback whales (Megaptera novaeangliae) • False killer whale (Pseudorca crassidens) • Minke whale (Balaenoptera acutorostrata) • Sowerby’s beaked whale (Mesoplodon bidens) Despite the high number of species presence, little is known about the ecology, abundance and distribution of cetaceans in the Aegean Sea (Ryan et al. 2014). Short-beaked common dolphins, once known to be the most common species in the Mediterranean Sea, are now fragmented and have suffered a loss in distribution and a decrease in population size by 70% in the last 50 years (Bearzi et al. 2003) with the Aegean Sea possibly being one of the few remaining strongholds for the species (Frantzis et al. 2003). Bottlenose dolphin and striped dolphins are believed to have declined by 50% and 30%, respectively over the past half century, despite being the most sighted species in the Mediterranean (Bearzi et al. 2008). Regarding the deep diving species of the Aegean Sea, sperm whales are thought to have less than 2500 adult individuals in the entire Mediterranean Sea whereas there is no estimation for Cuvier’s beaked whales or Risso’s dolphins. Interestingly, the Black Sea harbor porpoise has been increasingly sighted in recent years in the North Aegean Sea with no additional detailed studies or survey effort on the species (Cucknell et al. 2016). The only pinniped species of the Mediterranean, the Mediterranean Monk Seals is a known to have a presence extending to the Aegean Sea. The majority of the threats for each of the aforementioned species were common between species with varying magnitudes and mainly consisted of habitat destruction, shipping lanes, overfishing, recreational activities, military exercises, seismic practices for oil and gas, invasive species, disease outbreaks, pollution and climate change (Bearzi et al. 2008; Lusseau, 2004; Lusseau and Bejder 2007; Hoyt, 2014). 5 The Central Aegean Sea, Northern Sporades, Chios and Turkish waters were identified as Important Marine Mammal Habitat due to its importance for the Mediterranean Monk Seals and Thracian Sea-North Aegean Sea- is delineated as an IMMA for the presence of harbor porpoises by the Marine Mammal Protected Areas Task Force (https://www.marinemammalhabitat.org/). Despite the entire region being a candidate of Important Marine Mammal Area (cIMMAs), there is only a handful of dedicated survey efforts existing in the area, with none of them consisting of a year-round effort (Bearzi et al. 2003, Frantzis et al. 2003; Frantzis, 2009; Ryan et al. 2014; Giannoulaki et al. 2016). Throughout the Mediterranean Basin, dedicated survey efforts started in the early 1990s (Canadas et al. 2006; Forcada et al. 1996; Gordon et al. 2000; Boisseau et al. 2010; Frantzis et al. 2003, 2013) and most information previous to this originated from oppurtunistic sightings and stranding reports (Marchessaux 1980, Kinzelbach 1986). Since the 1990s, the Western Mediterranean Sea hosts a comparabily higher research effort than the Eastern Mediterranean Sea, including the Aegean Sea, resulting in a skewed knowledge of the western basin and leaving the Eastern Mediterranean Sea mostly blank on Mediterranean maps. Indeed, the Levantine Sea and Aegean Sea sub-regions received only 2.1% of the survey effort each when compared to the northwestern basin (Mannocci et al. 2018). Theore, both continuous and consistent long-term surveys are necessary to fill the existing gaps in baseline knowledge including encounter rates, population sizes, residency and movement patters as well as assessing the threats for species based on the defined critical habitats, as this will help to determine species’ regional status and thus guide conservation efforts to ensure that protected areas do not only exist on paper but that in-situ protections are in place! 6 PREVIOUS STUDIES Carpentieri et al. (1994) conducted the first dedicated survey effort in the Aegean Sea in 1993 and reported the presence of bottlenose dolphin, Risso’s dolphin, striped dolphins, sperm whales, fin whales and beaked whales with bottlenose dolphins being the most commonly encountered species. Gannier et al. (2002) conducted a survey from the Western to the Eastern Mediterranean Sea between
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